The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 2007
Filed:
Aug. 09, 2005
Juergen Hennig, Freiburg, DE;
Oliver Speck, Freiburg, DE;
Maxim Zaitse, Freiburg, DE;
Universitätsklinikum Freiburg, Freiburg, DE;
Abstract
A magnetic resonance (NMR) method for fast, dynamic, spatially resolved measurement of the temporal changes in NMR signals by means of repeated data acquisition in individual measurements (Acq) with measuring sequences which are sensitive to a parameter to be observed, in an NMR apparatus with shim coils for correcting the magnetic field is characterized in that during data acquisition of each individual measurement (Acq) in acquisition steps (SS) with a time lag, the magnetic field distribution in the NMR apparatus is measured, technically or physiologically based changes in the magnetic field distribution are determined therefrom in a calculation step (S) as well as a change in the currents in the magnetic field required for compensation thereof, and the dynamic changes in the magnetic field distribution are compensated for by means of the correspondingly changed shim currents. The inventive method permits dynamic detection of the changes in the magnetic field distribution through the above-mentioned factors during the measurement and compensation thereof through corresponding re-calculation of Δy(x,y,z) or ΔB(x,y,z) and adjustment of the shim currents to render the magnetic field distribution for subsequent measurements again preferably identical to the initial magnetic field distribution.